diff --git a/src/osd/modules/lib/osdlib_unix.cpp b/src/osd/modules/lib/osdlib_unix.cpp
index 0bcf34d04b2..ba3eec9662c 100644
--- a/src/osd/modules/lib/osdlib_unix.cpp
+++ b/src/osd/modules/lib/osdlib_unix.cpp
@@ -62,9 +62,9 @@ void osd_process_kill()
 
 void *osd_alloc_executable(size_t size)
 {
-#if defined(SDLMAME_BSD) || defined(SDLMAME_MACOSX)
+#if defined(SDLMAME_BSD) || defined(SDLMAME_MACOSX) || defined(SDLMAME_EMSCRIPTEN)
 	return (void *)mmap(0, size, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_ANON|MAP_SHARED, -1, 0);
-#elif defined(SDLMAME_UNIX)
+#else
 	return (void *)mmap(0, size, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_ANON|MAP_SHARED, 0, 0);
 #endif
 }